Often, my flatulence is accompanied by a clear, slimy, wet substance.
it also appears just prior to defecating on the toilet.

Does this stuff have a name? where does it come from? what can I do to
reduce its presence?

(and I swear, I'm not normally this obsessed with bowel function, but
this has been happening to me for years, and I've never been able to
put a name to this stuff.)